In this thread the new, global/generalized Sagnac effect formula will be derived. Sagnac formula for an interferometer whose center of rotation coincides with its geometrical center:Δt = l/(c - v) - l/(c + v) = 2lv/c2Sagnac formula for an interferometer located away from the center of rotation (different radii, different velocities):Δt = (l1 + l2)/(c - v1 - v2) - (l1 + l2)/(c + v1 + v2) = 2[(l1v1 + l2v2)]/c2 The Sagnac effect formula for an interferometer whose center of rotation coinc